<%@page contentType="text/html; charset=UTF-8"  language="java"%>
<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>表达式实例1</title>
</head>
<%
    String url = "expressionHref.jsp";
%>
<body>
<a href="<% url%>">点击跳转</a>   //超级链接指向url指代的页面

<form action="<% url%>">   //url指代的页面规定了处理表单信息的页面
    <input type="submit"value="点击跳转"/>
    </form>
</body>
</html>